Follow the steps to increase the Dropbox size by 640MB.
I was just browsing and looking for some free extra space on drop box and found this.. Got official 640 MB of extra free space on drop box :)
1. Sign into your existing Dropbox account (or create a new account)
2. Click on the link: https://www.dropbox.com/free
3. Follow the 5 instructions given there and get 128MB each for completing each task.
So you get 640MB (128*5) additional free storage..
